text: Tattvārthasūtra, meaning "On the Nature [<nowiki/>artha] of Reality [<nowiki/>tattva]" (also known as Tattvarth-adhigama-sutra or Moksha-shastra) is an ancient Jain text written by Acharya Umaswami in Sanskrit, sometime between the 2nd- and 5th-century CE. 
  The Tattvārthasūtra is regarded as one of the earliest, most authoritative texts in Jainism. It is accepted as authoritative in both its major sub-traditions – Digambara and Śvētāmbara – as well as the minor sub-traditions. It is a philosophical text, and its importance in Jainism is comparable with that of the Brahma Sutras and Yoga Sutras of Patanjali in Hinduism. In an aphoristic sutra style of ancient Indian texts, it presents the complete Jainism philosophy in 350 sutras over 10 chapters. The text has attracted numerous commentaries, translations and interpretations since the 5th-century.
  One of its sutras, Parasparopagraho Jivanam is the motto of Jainism. Its meaning is interpreted as "(The function) of souls is to help one another", or "Souls render service to one another".